Balance Sheet Details (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 120,921	$ 114,239
Accumulated Amortization	(55,658)	(46,108)
Net Carrying Amount	65,263	68,131
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	103,031	99,463
Accumulated Amortization	(47,899)	(40,010)
Net Carrying Amount	55,132	59,453
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,941	8,399
Accumulated Amortization	(3,778)	(3,123)
Net Carrying Amount	7,163	5,276
Patents And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,044	3,044
Accumulated Amortization	(2,587)	(2,525)
Net Carrying Amount	457	519
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,173	1,173
Accumulated Amortization	(445)	(250)
Net Carrying Amount	728	923
Non-Compete Covenants [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,732	2,160
Accumulated Amortization	(949)	(200)
Net Carrying Amount	$ 1,783	$ 1,960